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Now you don't see it; now you do. The invisible swath of X-ray radiation that baths the universe arises in large part from X-ray-bright, optically faint galaxies at extremely far distances. Above, the "big three" -- Hubble Space Telescope, Keck Observatory and The University of Hawaii 2.2 meter telescope -- detect no or little evidence of any light source. The Chandra X-ray Observatory, peering in the same deep field, spots the culprits. The observation suggests that the Hubble Deep Field may have missed a large population of Active Galaxies.
(Credit: NASA/GSFC/R.Mushotzk y et al. )
Description
Now you don't see it; now you do. The invisible swath of X-ray radiation that baths the universe arises in large part from X-ray-bright, optically faint galaxies at extremely far distances. Above, the "big three" -- Hubble Space Telescope, Keck Observatory and The University of Hawaii 2.2 meter telescope -- detect no or little evidence of any light source. The Chandra X-ray Observatory, peering in the same deep field, spots the culprits. The observation suggests that the Hubble Deep Field may have missed a large population of Active Galaxies.
(Credit: NASA/GSFC/R.Mushotzk y et al. )
Description
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